From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:56453 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030368AbbKDPUh (ORCPT ); Wed, 4 Nov 2015 10:20:37 -0500 Subject: [PATCH 3/4] cachefiles: perform test on s_blocksize when opening cache file. From: David Howells To: viro@ZenIV.linux.org.uk Cc: linux-nfs@vger.kernel.org, NeilBrown , linux-kernel@vger.kernel.org, dhowells@redhat.com, linux-cachefs@redhat.com, linux-fsdevel@vger.kernel.org Date: Wed, 04 Nov 2015 15:20:34 +0000 Message-ID: <20151104152034.2987.22424.stgit@warthog.procyon.org.uk> In-Reply-To: <20151104152005.2987.46683.stgit@warthog.procyon.org.uk> References: <20151104152005.2987.46683.stgit@warthog.procyon.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: From: NeilBrown cachefiles requires that s_blocksize in the cache is not greater than PAGE_SIZE, and performs the check every time a block is accessed. Move the test to the place where the file is "opened", where other file-validity tests are performed. Signed-off-by: NeilBrown Signed-off-by: David Howells --- fs/cachefiles/namei.c | 2 ++ fs/cachefiles/rdwr.c | 6 ------ 2 files changed, 2 insertions(+), 6 deletions(-) diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c index fc1056f5c96a..c4b893453e0e 100644 --- a/fs/cachefiles/namei.c +++ b/fs/cachefiles/namei.c @@ -655,6 +655,8 @@ lookup_again: aops = d_backing_inode(object->dentry)->i_mapping->a_ops; if (!aops->bmap) goto check_error; + if (object->dentry->d_sb->s_blocksize > PAGE_SIZE) + goto check_error; object->backer = object->dentry; } else { diff --git a/fs/cachefiles/rdwr.c b/fs/cachefiles/rdwr.c index 3cbb0e834694..e76c2452ac40 100644 --- a/fs/cachefiles/rdwr.c +++ b/fs/cachefiles/rdwr.c @@ -414,9 +414,6 @@ int cachefiles_read_or_alloc_page(struct fscache_retrieval *op, ASSERT(inode->i_mapping->a_ops->readpages); /* calculate the shift required to use bmap */ - if (inode->i_sb->s_blocksize > PAGE_SIZE) - goto enobufs; - shift = PAGE_SHIFT - inode->i_sb->s_blocksize_bits; op->op.flags &= FSCACHE_OP_KEEP_FLAGS; @@ -711,9 +708,6 @@ int cachefiles_read_or_alloc_pages(struct fscache_retrieval *op, ASSERT(inode->i_mapping->a_ops->readpages); /* calculate the shift required to use bmap */ - if (inode->i_sb->s_blocksize > PAGE_SIZE) - goto all_enobufs; - shift = PAGE_SHIFT - inode->i_sb->s_blocksize_bits; pagevec_init(&pagevec, 0);